1z6b
From Proteopedia
(New page: 200px<br /><applet load="1z6b" size="450" color="white" frame="true" align="right" spinBox="true" caption="1z6b, resolution 2.09Å" /> '''Crystal structure of...) |
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| - | [[Image:1z6b.gif|left|200px]]<br /><applet load="1z6b" size=" | + | [[Image:1z6b.gif|left|200px]]<br /><applet load="1z6b" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1z6b, resolution 2.09Å" /> | caption="1z6b, resolution 2.09Å" /> | ||
'''Crystal structure of Plasmodium falciparum FabZ at 2.1 A'''<br /> | '''Crystal structure of Plasmodium falciparum FabZ at 2.1 A'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The unique beta-hydroxyacyl-ACP dehydratase in Plasmodium falciparum, PfFabZ, is involved in fatty acid biosynthesis and catalyzes the | + | The unique beta-hydroxyacyl-ACP dehydratase in Plasmodium falciparum, PfFabZ, is involved in fatty acid biosynthesis and catalyzes the dehydration of beta-hydroxy fatty acids linked to acyl carrier protein. The structure was solved by single anomalous dispersion (SAD) phasing using a quick-soaking experiment with potassium iodide and refined to a resolution of 2.1 A. The crystal structure represents the first structure of a Plasmodium beta-hydroxyacyl-ACP dehydratase with broad substrate specificity. The asymmetric unit contains a hexamer that appears as a trimer of dimers. Each dimer shows the known "hot dog" fold that has been observed in only a few other protein structures. Each of the two independent active sites in the dimer is formed by equal contributions from both subunits. The active site is mainly hydrophobic and looks like an L-shaped tunnel. The catalytically important amino acids His 133 and Glu 147' (from the other subunit), together with His98', form the only hydrophilic site in this tunnel. The inner end of the active site tunnel is closed by the phenyl ring of Phe 169, which is located in a flexible, partly visible loop. In order to explain the acceptance of substrates longer than ~C-7, the phenyl ring must move away to open the tunnel. The present structure supports an enzymatic mechanism consisting of an elimination reaction catalyzed by His 133 and Glu147'. 3-decynoyl-N-acetylcysteamine, an inhibitor known to interact with the E. coli dehydratase/isomerase, turned out to interact covalently with PfFabZ. A first model of PfFabZ with this potent inhibitor is presented. |
==About this Structure== | ==About this Structure== | ||
| - | 1Z6B is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Plasmodium_falciparum Plasmodium falciparum] with CL, CAC and SO4 as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | + | 1Z6B is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Plasmodium_falciparum Plasmodium falciparum] with <scene name='pdbligand=CL:'>CL</scene>, <scene name='pdbligand=CAC:'>CAC</scene> and <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Z6B OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Perozzo, R.]] | [[Category: Perozzo, R.]] | ||
[[Category: Scapozza, L.]] | [[Category: Scapozza, L.]] | ||
| - | [[Category: Winkler, F | + | [[Category: Winkler, F K.]] |
[[Category: CAC]] | [[Category: CAC]] | ||
[[Category: CL]] | [[Category: CL]] | ||
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[[Category: sad phasing]] | [[Category: sad phasing]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:12:34 2008'' |
Revision as of 14:12, 21 February 2008
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Crystal structure of Plasmodium falciparum FabZ at 2.1 A
Overview
The unique beta-hydroxyacyl-ACP dehydratase in Plasmodium falciparum, PfFabZ, is involved in fatty acid biosynthesis and catalyzes the dehydration of beta-hydroxy fatty acids linked to acyl carrier protein. The structure was solved by single anomalous dispersion (SAD) phasing using a quick-soaking experiment with potassium iodide and refined to a resolution of 2.1 A. The crystal structure represents the first structure of a Plasmodium beta-hydroxyacyl-ACP dehydratase with broad substrate specificity. The asymmetric unit contains a hexamer that appears as a trimer of dimers. Each dimer shows the known "hot dog" fold that has been observed in only a few other protein structures. Each of the two independent active sites in the dimer is formed by equal contributions from both subunits. The active site is mainly hydrophobic and looks like an L-shaped tunnel. The catalytically important amino acids His 133 and Glu 147' (from the other subunit), together with His98', form the only hydrophilic site in this tunnel. The inner end of the active site tunnel is closed by the phenyl ring of Phe 169, which is located in a flexible, partly visible loop. In order to explain the acceptance of substrates longer than ~C-7, the phenyl ring must move away to open the tunnel. The present structure supports an enzymatic mechanism consisting of an elimination reaction catalyzed by His 133 and Glu147'. 3-decynoyl-N-acetylcysteamine, an inhibitor known to interact with the E. coli dehydratase/isomerase, turned out to interact covalently with PfFabZ. A first model of PfFabZ with this potent inhibitor is presented.
About this Structure
1Z6B is a Single protein structure of sequence from Plasmodium falciparum with , and as ligands. Full crystallographic information is available from OCA.
Reference
The crystal structure of PfFabZ, the unique beta-hydroxyacyl-ACP dehydratase involved in fatty acid biosynthesis of Plasmodium falciparum., Kostrewa D, Winkler FK, Folkers G, Scapozza L, Perozzo R, Protein Sci. 2005 Jun;14(6):1570-80. PMID:15930004
Page seeded by OCA on Thu Feb 21 16:12:34 2008
